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I started toying with the idea of trading my Heir Audio 4.ai's in for a over the ear headphones in a similar price range. However I'm not sure how the headphones would compare to the sound of the IEM's I currently have. The headphones I'm looking at are the Sennheiser HD600 or the Beyerdynamic DT880 or DT990. Does anyone know how these headphones compare to the 4.ai's?